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As I recall, all the flora of North America got concentrated there during the glaciations, hence the decidedly diverse deciduosity.

It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II
by eurogreen on Wed Aug 1st, 2012 at 06:02:14 AM EST
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The Ozarks have been above sea level and ice free for 400 million years, if I recall correctly. So, at a minimum, there would have been no glacial extinctions here, even if the ice sheet had reached this latitude elsewhere, which it did not. But we are part of a very ancient ecosystem, relatively.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Wed Aug 1st, 2012 at 10:32:50 AM EST
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